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OMV Exploration & Production Move & More. Rejuvenation of a mature oil field: Underground Gas Storage and Enhanced Oil Recovery, Schönkirchen Tief Field,

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Presentation on theme: "OMV Exploration & Production Move & More. Rejuvenation of a mature oil field: Underground Gas Storage and Enhanced Oil Recovery, Schönkirchen Tief Field,"— Presentation transcript:

1 OMV Exploration & Production Move & More. Rejuvenation of a mature oil field: Underground Gas Storage and Enhanced Oil Recovery, Schönkirchen Tief Field, Austria IEA-EOR Conference 2009 Torsten Clemens, Joop de Kok, Yannick Yanze

2 2 | Torsten Clemens, Joop de Kok, Yannick Yanze Gas supply shortage in 2008

3 3 | Torsten Clemens, Joop de Kok, Yannick Yanze Outline Reservoir overview Concept Underground Gas Storage (UGS) + Enhanced Oil Recovery (EOR) Simulation setup Optimization of UGS Dewatering Cycling EOR Conclusions

4 4 | Torsten Clemens, Joop de Kok, Yannick Yanze Reservoir overview Highly fractured dolomite Water- to mixed wet 19 mn Sm 3 STOIIP GOC at 2550 mss OWC 2740 mss Producing since 1962 Current recovery factor 59 % Water flooded

5 5 | Torsten Clemens, Joop de Kok, Yannick Yanze Historical production – initial conditions

6 6 | Torsten Clemens, Joop de Kok, Yannick Yanze Historical production – initial oil production phase

7 7 | Torsten Clemens, Joop de Kok, Yannick Yanze Historical production – initial oil production phase

8 8 | Torsten Clemens, Joop de Kok, Yannick Yanze Historical production – perforation higher

9 9 | Torsten Clemens, Joop de Kok, Yannick Yanze Historical production – water injection

10 10 | Torsten Clemens, Joop de Kok, Yannick Yanze Historical production – current conditions

11 11 | Torsten Clemens, Joop de Kok, Yannick Yanze Sor w = 25% Historical production – current conditions

12 12 | Torsten Clemens, Joop de Kok, Yannick Yanze Underground Gas Storage & EOR - fractures

13 13 | Torsten Clemens, Joop de Kok, Yannick Yanze Underground Gas Storage & EOR - fractures

14 14 | Torsten Clemens, Joop de Kok, Yannick Yanze Underground Gas Storage & EOR - fractures

15 15 | Torsten Clemens, Joop de Kok, Yannick Yanze Sor w = 25% Sor g = 15% Underground Gas Storage & EOR - matrix

16 16 | Torsten Clemens, Joop de Kok, Yannick Yanze Simulation setup Is it possible to build up the required volumes of gas? How long does it take to build up the UGS? Is dewatering required? How much cushion gas is required to safely produce the gas volumes? How many wells are necessary to inject and produce the required gas volumes? Where to place the injection / production wells? What are the risks and uncertainties? Is there any EOR potential? Is there an opportunity to accelerate current production?

17 17 | Torsten Clemens, Joop de Kok, Yannick Yanze Dual-permeability approach: two superimposed grids Fracture grid fracture-fracture exchanges Matrix grid matrix-matrix exchanges P m, S m P f, S f unknowns k m, m k f, f, σ input properties matrix-fracture exchanges Simulation setup

18 18 | Torsten Clemens, Joop de Kok, Yannick Yanze History match Multiple history matches Multiple predictions

19 19 | Torsten Clemens, Joop de Kok, Yannick Yanze Optimization of UGS – phased approach Time in years Phase 1 Total injected gas [billion m³]

20 20 | Torsten Clemens, Joop de Kok, Yannick Yanze Optimization of UGS – phased approach Time in years Phase 1 Monitoring phase Total injected gas [billion m³]

21 21 | Torsten Clemens, Joop de Kok, Yannick Yanze Optimization of UGS – phased approach Time in years Phase 1 Monitoring phase Phase 2 Total injected gas [billion m³]

22 22 | Torsten Clemens, Joop de Kok, Yannick Yanze Dewatering to increase gas volume Time in years Without dewatering Total injected gas [billion m³]

23 23 | Torsten Clemens, Joop de Kok, Yannick Yanze Dewatering to increase gas volume Time in years Without dewatering With dewatering Total injected gas [billion m³]

24 24 | Torsten Clemens, Joop de Kok, Yannick Yanze Dewatering to increase gas volume Original oil/water contact Vertical dewatering wells Water injection into sandstone Horizontal gas injection wells

25 25 | Torsten Clemens, Joop de Kok, Yannick Yanze Gas/liquid contact movement in the fractures

26 26 | Torsten Clemens, Joop de Kok, Yannick Yanze UGS & EOR - concept Downdip production wells Original oil/water contact Crestal gas injection wells Oil rim Residual oil 25 % Residual oil 15 %

27 27 | Torsten Clemens, Joop de Kok, Yannick Yanze Enhanced Oil Recovery (EOR)

28 28 | Torsten Clemens, Joop de Kok, Yannick Yanze Enhanced Oil Recovery (EOR) Production of incremental oil after several cycles Up to 5 % recovery of incremental oil in place

29 29 | Torsten Clemens, Joop de Kok, Yannick Yanze Effect of gas cycling on oil production

30 30 | Torsten Clemens, Joop de Kok, Yannick Yanze Gas/Oil Contact in Fractures and Matrix Gas Injection Gas Production Gas/Oil Contact in Fractures Water/Oil Contact in Fractures Gas/Oil Gravity Drainage in Matrix Well Gas invasion in matrix

31 31 | Torsten Clemens, Joop de Kok, Yannick Yanze Conclusions Schönkirchen Tief is good candidate reservoir for high performance Underground Gas Storage 1.5 bn m³ gas can be injected in phase one and 3 bn m³ gas in phase two (dewatering required)

32 32 | Torsten Clemens, Joop de Kok, Yannick Yanze Conclusions Schönkirchen Tief is good candidate reservoir for high performance Underground Gas Storage 1.5 bn m³ gas can be injected in phase one and 3 bn m³ gas in phase two (dewatering required) De-watering can be optimised by drilling vertical wells deep below the original oil/water contact Enhanced Oil Recovery can be achieved due to the difference in residual oil saturation towards water and gas Up to 5 % incremental oil can be recovered

33 33 | Torsten Clemens, Joop de Kok, Yannick Yanze Acknowledgements Thanks to: OMV E&P for the permission to publish this paper


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